You can't ignore the problem and hope it goes away. It is a fact that half the population has below average IQ, and their labor is the most valuable thing they can offer. As that labor becomes obsolete, what do we do? Telling people to be more like Edison is not a realistic approach to this looming problem.
Failing to solve a person's problem for them is not the same as ignoring it. What society can (and should) do is be honest with people. Tell folks if what they're doing now is not very valuable or will likely have no value at all (become obsolete) in the near future.
The reality is if many people do not become more like Edison, if they do not start finding ways to contribute other than running errands and turning wheels, then (according to your prediction) their contributions will become obsolete. Their current contributions will no longer be valued by society. You have not established as a fact that half the population has nothing to offer more valuable than zero.
It is my sincere hope people will listen. If they choose to ignore the problem and hope it goes away... the future will be difficult for them.